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6,889
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Media Type
5,960
texts
506
audio
384
movies
21
images
10
data
4
concerts
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Topics & Subjects
2,585
ERIC Archive
2,386
NASA Technical Reports Server (NTRS)
1,869
FEEDBACK CONTROL
1,854
Feedback
853
Feedback (Response)
810
FEEDBACK
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Collection
2,575
Education Resources Information Center (ERIC) Archive
2,386
NASA Network Resource and Training Site
357
Community Audio
289
Community Video
258
NASA Technical Documents
235
The Magazine Rack
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Creator
2,585
eric
2,386
nasa technical reports server (ntrs)
213
huda tv
212
defense technical information center
29
keith hughes
27
non
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Language
6,246
English
3
German
2
Arabic
2
Urdu
1
Asturian
1
Dutch
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